2013pete 386 trailer turn signal problem

Trailer bulb/light.

 

I didn't read your original post correctly. Can't speak for the new signal light assemblies, but the old signal stat could get dirt on the contact which would prevent it from completing the circuit.

 

The prongs inside either the male or female end of the electrical connection can become bent, loose, ect... if you plug it in with a tie wrap between them to make it tight then check flashers. I can't count how many times I've had this happen. Look at prongs and adjust them as needed.

 

Yes especially if you've done any hard jacking into tight places. I found loose wires inside of the trailer cord plug connector

 

I know this is an old thread, but did anyone figure the problem? I'm having the same issue with my 2012 Peterbilt 386.

 

Hi had the right blinker out on trailer not left. Of course did the obvious truck to trailer cord. Sent it to local shop and it worked so can’t fix it if not broke right? Well crawled all over found a connection in front of exhaust barrel left frame corrosion cleaned if put dialectic grease and so far so good. GOOD LUCK